Pixhawk 4 - Please help with armed

Hello, I need help setting up. I have Pixhawk 4 (Holybro) with V2.2 distribution board.
Everything is calibrated, only green. I deactivated air speed. According to instructions. Transmitter connected - calibrated. ESC Calibration - OK, motors connected to terminals M1, M2, M3
Everything seems OK just can’t arming.
Pixhawk says: Not arming: preflight checks failed
Please for advice, I don’t know how to go any further.

Thank you

:slight_smile: I know what it is.